hey buddy , it is possible but it involves a lot of work!! cut the mk3 bracket of the floor pan. you need to fabricate a new bracket weld it to the floor you also need to trim the outside wheel down a good bit both on height and width. there s also a little wheel you need to trim off to allow you to slide the wheel down the runners. the rear suits are a bit more fiddly though, they invlove pullin the new material and foam off the seat and its a direct replacement for the whole seat(it fits nicely but a not perfect) doing this saves a lot of cuttin and makin new brackets

i done this a couple of weeks ago took me about 5 hours or so but that was me bein a bit lazy

mate you wont regret doin it so comfy and so much more support!!!